The claim is that the proportion of adults who smoked a cigarette in the past week is less than 0.25 and the sample statistics include n=1150 subjects with 265 saying that they smoked a cigarette in the past week. Find the value of the test statistic.

Q: Use the sample mean(78.5)and sample standard deviation (12.3671)in your calculations below. Use…

A: Given that:

Q: In a multiple-choice examination in Chemistry, students Mae and Julie received scores of 82 and 65,…

A: We have given that.   X~N( μ , ?^2 )   μ = , ? =   Z-score =( x - μ )/?

Q: The Computer Anxiety Rating Scale (CARS) measures an individual’s level of computer anxiety, on a…

A:

Q: A set of n = 6 scores has a mean of M = 10. Another set of scores has n = 4 and M = 15. If these two…

A: The combined mean can be calculated as, Xc = n1 x1 +n2 x2 n1+n2 Were, n1 is the sample size for the…

Q: What percent of cans will have a caffeine content greater than 35 mg?

A: Let X be the random variable of the caffeine content of a cola.Given that,Population mean

Q: The P-value for a one-sided test for a mean is 0.06. The P-value for the corresponding two-sided…

A:

Q: With your sample of 25 inmates, you want to test if the population mean age is different from 40 at…

A: To determine whether the test should be one-tailed or two-tailed, we need to consider the research…

Q: 1 2 13 r= 4 5 9 3 8 6 5 Calculate the sample correlation coefficient (r) to three decimal places.…

A:

Q: When a data set has one or two values that are much higher than all of the others which of our 3…

A: As Mean is found by adding all the values and dividing by the number of values So if one or two…

Q: n 1971, there was a shift in attitudes, as Americans’ “ideal” family switched from four kids to two…

A: The median would stay the same as it is not affected by outliers   The mean would increase as it is…

Q: Please also explain why you determined whether or not the results are statistically significant.…

A: Given information isn1=40n2=40s1=0.50

Q: In a city with three high schools, all the ninth graders took a Standardized Test, with these…

A: Introduction: Suppose there are k groups, such that the jth group [j = 1, 2, …, k] has nj…

Q: IQ scores for subjects with medium lead levels in their blood and another sample of subjects with…

A: Mann-Whitney U test: The Mann-Whitney U test is non-parametric statistical method that is used for…

Q: The claim is that the proportion of adults who smoked a cigarette in the past week is less than 0.35…

A:

Q: A sample consists of the following n = 6 scores: -2, 3, -3, 1, -3, 4 What is the Z-score for the raw…

A: Given data set is -2,3,-3,1,-3,4sample size(n)=6

Q: Tom scored a 117 on a measure of math ability and a 41 on a measure of verbal ability. The means and…

A:

Q: A company wanted to determine the child care costs of its employees. A sample of 25 employees were…

A: Solution :  In above example a value of one of the sample change so we know that standard deviation,…

Q: The table below summarizes the  results of a survey in which randomly selected people were asked how…

A: It is needed to test, whether the feelings on medical marijuana and gender are independent or not.

Q: Consider the following distribution of scores: 2,5,3,7,6,5. What is the mean?

A:

Q: tor for a medical assistance program wishes to test the hypothesis that her students score higher…

A: As the population standard deviation is not known, we will use a t-test. The null and alternative…

Q: For the test described in Scenario A, 32 apartments were measured and the sample mean found to be…

A: Given that  Sample size n =32 Sample mean =1237 Standard deviation =45

Q: The IQ scores for a random sample of subjects with medium lead levels in their blood and another…

A: Given the data as Medium Lead Level High Lead Level 66 91 98 61 64 88 87 73 63 76 84…

Q: The sample mean is the point estimator of 18

A:

Q: In 2009, it was estimated that 63% of Americans supported the death penalty. In 2014, a Rasmussen…

A: sample size(n)=943 No. of Americans supported the death penalty(x)=536 population proportion=0.63

Q: The Congressional Budget Office reports that 36% of federal civilian employees have a bachelor's…

A: Given, n=119, x=31, α=0.05 Then, p^=31119=0.260504

Q: A school counselor randomly selects a sample of 30 students to investigate the impact of a behavior…

A: Solution-:A school counselor randomly selects a sample of 30 students to investigate the impact of a…

Q: One sample has n = 5 scores and M = 10. A second sample has n = 20 scores and M = 5. If the two…

A:

Q: The Computer Anxiety Rating Scale (CARS) measures an individual’s level of computer anxiety, on a…

A: From the sample information, it is interpreted that: For males: The sample standard deviation,…

Q: A police officer waits on a road to catch speeding cars. In a one hour sample, the officer find that…

A:

Q: You want to compare the performance on a learning task of a group of 20 subjects who have been given…

A: Introduction: Denote μ as the true average number of correct responses by those who under Drug P.…

Q: Which of the following is the appropriate null and alternative hypotheses for the test described in…

A:

Q: The Computer Anxiety Rating Scale (CARS) measures an individual’s level of computer anxiety, on a…

A: 5

Q: In a city with three high schools, all the ninth graders took a Standardized Test, with these…

A: For three high school, mean score on test and number of ninth graders is given.i.e n1=281, n2=343,…

Q: For a sample of 11 employees, the most recent hourly wage increases were 18, 30, 25, 5, 7, 2, 20,…

A: Given data , 18, 30, 25, 5, 7, 2, 20, 12, 15, 25,40

Q: A research article stated that there was a mean difference in depressive symptoms between male and…

A: From the provided information, The claim is that there was a mean difference in depressive symptoms…

Q: Imagine a researcher wants to determine whether the participants in his sample are skewed toward…

A: Introduction: When the mean of one group is to be compared to a fixed value, or the means of two…

Q: A social psychologist recently developed a childhood-memories test that is intended to measure how…

A: Hypothesis,  H0: The mean score is u= 60 H1: The mean score is not 60. u=! 60 Given that, Mean, x̄=…

Q: A social psychologist recently developed a childhood-memories test that is intended to measure how…

A: The hypothesize mean is 60.

Q: The IQ scores for a random sample of subjects with medium lead levels in their blood and another…

A: We have to determine null and alternative hypothesis denoted by H0 and H1.

2-Proportion Test

In a 2-proportion test, two separate proportions are measured at the same time, and their similarity is evaluated. It is also known as a 2-proportion z-test, and a comparison of two different proportions is done in this method.